4X4 ESOF problem
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Joined: Apr 2012
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From: Huntington WV
4X4 ESOF problem
My sons Oct 2002 F-250 ESOF does not work. I replaced the vacuum seals last month, new orings, lubed the hubs and did a complete ESOF ops check and everything worked as it should. Now the transfer case will lock in Hi and Lo but not engage the front axle. Vacuum pump works but I don't have the 4X4 or low lock dash lights lit. Any ideas????
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From: Huntington WV
Performed a vacuum test with a gage and there are no leaks and I can manually lock the front hubs with my vacuum pump. I had already checked fuse's 111 & 19 with a fluke ohm meter. I will check the others in the am. I can hear the T-case lock into Hi and it will slip into low range, verfied by driving in Lo range. No dash lights for 4X4 at any time, even key on light check.
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From: Montana
I bought a new Quigley and drove it from Maine to Montana. first snow got me all excited. no 4 wheel. great.
but mine is manual and still done engage. getting it rebuilt Dec 3rd. hoping I dont have to buy new hubs too.
oh what fun. my list is revolving it seems like. and these are no mods or upgrades. its making things run good before I do the other things.
mine in 4hi would not turn the front axle. 4 low did. and when I turned my hubs to lock they felt as if they were soft or not even engauging. makes me worried when I get to that point. first things first. transfer case for me
but mine is manual and still done engage. getting it rebuilt Dec 3rd. hoping I dont have to buy new hubs too.
oh what fun. my list is revolving it seems like. and these are no mods or upgrades. its making things run good before I do the other things.
mine in 4hi would not turn the front axle. 4 low did. and when I turned my hubs to lock they felt as if they were soft or not even engauging. makes me worried when I get to that point. first things first. transfer case for me
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From: Huntington WV
I will check the relays and module this morning. My sons 03 is quite a bit different electric wise than my 01. I will let you know what I find.
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From: Huntington WV
The ESOF relays are working and all the fuses are good. The transfer case goes into 4 Hi and 4 Lo and back to 2 WD just fine. The cluster lights for 4X4 and 4 Lo never iluminate at any time. Vacuum pump works but there is not a signal for the vacuum switch to work. I think it's the 4 WD module. Any other ideas???? 2003 7.3L Crew Cab
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From: Alfred NY and Long Island
Hey not trying to hijack your thread here...where did you find the relays for the 4wd? I have been trying to find them on my 01. My truck will go into 4hi or 4 low but then wont come back out...
I think its a relay
I think its a relay
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From: Huntington WV
If your sitting in the drivers seat, on the left side of the master cyl. Remove the small plastic cover to expose the relays. It will be two identical relays. If you have trailer tow there will be another relay box with three relays and those three relays are trailer tow only. You want the two relay unit.
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From: Huntington WV
Replaced the 4X4 module under the dash (great fun) and the 4X4 lights on the dash will not illuminate nor will the front axle engage. The transfer case works, I can hear the t-case motor lock and unlock, ESOF system. Any ideas???
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From: Payson, AZ
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From: Huntington WV
I have vacuum to the PVH solenoid, but I don't believe it's getting a signal to function. I was under the impression the signal came from the 4X4 module, and I put a new one in, but that didn't work as planned. Didn't make a difference. 
This is not my 01 it's my son's 7.3 03. Relays work fine.
This is not my 01 it's my son's 7.3 03. Relays work fine.